Process of making camphor



i smeiiissi Ange 351i, iii iin HARRY D. GET BBEZ, U1? EENNS DELARWARE,

{No ilirawing.

This invention relates so the praiiiuctioii exidizeci czim'piwi? in the iiquid piiaiss by certain substances the most useful 01% thesis ap mieniiy being- DiUiC ricii. has been propesci in U. S. Pat @1111". N0. 801,4i who oxidize isoimmsal-in' the W.- poi' phase by heating 'iSOiJOTRlBOi vapor ami air a tempera-tum 0i? fmm is l in? from fibres in sigg; it iwurs in the presems 0i camper 0-1 am imi'i; substance, such as emthsmvsmu The action of the supper in ibis sass, as in other reactinns invoiving' "fll'gffiilic substances, is that iii a dehydrogei ai-imi saitsiysib iii seeking i4 improve; upon the Vapor piiass sxiziaiima 02% homes]. sf isobm'neoh siitiqsi." iii which may be referred in gsnsri- 6211137 as a, berries}, we have fmmd. that a rsmarksbis decrease in reaction tims as 00m- 'pareii with ths pracess of she above-mew iioned patent, Wail as batter yisid,- is iii-mined by wringing barnssi or issbomssi 72 4101- mixsci with an oxygsn-containing gas such as {EXIVQQR 01 air, in cimisci; with 0xicies sf Vanadium, moiyhdeli-mics 01' chmmi um 22: temperatures mugging from 200 30 600 Thsss nxiiiss sci; as; true oxidation csicziiysis' a-ndjme sharply iistinguisheri in this raspsci: 5mm cishydmgenatien catalysis such as aoppsi.

To make: clear ths differs; in the reaciimi times of pressiit' process and of the 01d vapsr phase {JKQCESE, it may be said that in the process 0:? the present 02s., a yieid 05 more khan 20% cmnghor is ebtaixleci. when a given poriion, such as 011esubic censimsien 0f the airways? mixture is maintained in csntaci; Wit: vanariium GXiiS at B, tempera-1 tum oi. 300 C. for a few secmicis (that is, less a, minute), as compared. with a yisic'i m about 6% cmnphm" wii sn the airvapoz" miinburs is maintained in. eorimcb with 13875981 the optimum ismpemtuis (l ?i- 1'i" C1,} i391" Hires hams.

Applis miou filed fifsvember :23, 1mm. Serial Trio. 42mm.

@111 pr ocsss may be iiiusiamted the f ilowing" exampie:

Isabg'meei wa ver is mixsoi Wiii] air in the piopoi ticn of 0m 55mm isnbox'neoi tn ai 0iit "0ne iit er of air and 2760 mm. presmm}, and the vapor mizqture is passed inte cioss cmimm; with an {if-Ii dation ea'talyst at H; tei'npi-iraturs of from 275 to 325 b. The catalystwhich we prefer is vsnmiic pxicie ei'ihsr in powdered fawn,

measuifecl iii; 520 (3..

01' laced u on a carrier such as )HHiiOB 01' 66 in the fused canditicn. The ifi-bpifi mixture leaving the camiyst is passed 5min a condens-si- Where the csm'phsr my mm changer isebsrnemi am condienssi mici separated irmn the psrmmreiii; gssss. Same csmphens is usuaiiy farmed aiming the ream tion and is sepaiwzsd at the same iime.

The proportion 03% isoiwriissi in air which may he usmi is imt limited in the propor' tion givsn in the sbcws emmpis may may Within wide limits. Tins rsitis 01? air to isnimmeai may far smmpis ha as low as 34;. iiiei 0f sis in Ti 5mm of isahsmeui, and as high as 2015mm; 01% air is 1 gram of isobm'moi; we prsfer to use a piopoi'tisn off Hi1 Within the mag-s 0:? 0.5 so 1% likes for: each gram 0% isshariisoi.

As cwmiysizs "the 0" d ed-s 0f nioiybcismiin, ami pasticulariy meiyiaiiic snilydride, appear in iae as sstisifsctm'y as the oxides of vsziaciirim. Chromium asides ("fur exampi, 0 02m sisa bi; einpioyeii to advan bags, aithmiggh 210i; 500d ii smbsiiysi; as the sx'icies mi vmssiium. and moiybdenum.

The yield of czimpiioiis umiiimriiy 2595' 01 more of ths isniiomeai initially present in the Ia-pm. HfiiXiRlTfi, this yiioi bsing; inmes ed by sepassiiy 's .nver the caizsiysi: of dP-umsei Whici; ,mnminec'i unchanged in him first iii "er said catalyst "We claim!- 1. The precsss of making campiior which mmprises subjecting isoborneoi in the gas was stabs mixed with air in the ratio of 1 gram of isoiiom'eoi to from about 0.5 to 10 iisers 01% air, measursd at 29 F. and 760 mm. pressure, to the action 01 an oxidaiion czutziiyst msiiimineci at a temperature Eisizweem 2-00 ml. 600 '1.

E2. The prowess of making csimpimr which mmprisss subjecting isobiirneai in the gssenus stasis mixsiii with in i'atio of 2. gram 0% iiiflbflfil'fifll m BEITME-Fi sham; 0.5130 10 liters of air, measured at 20 C. and 760 mm. pressure, to the action of an oxidation catalyst maintained. at a temperature between 200 and 600 6., the period of contact of any one cubic centimeter of the gas mixture with the catalytic surface being from a few seconds to about one minute.

3. The process of making camphor which. comprises subjecting isoborneoi in the gaseous state mixed with air in the ratio of 1 gram of isobo'rneol to from about 0.5 to 10 liters of air, measured at 20 C. and 760 mm. pressure, to the action of an oxide of vanadium.ma-intained at a temperature between 200 and 600 C., the period of contact of any one cubic centimeter of the gas mixture with the catalytic surface being from a few seconds to about one minute.

In testimony whereof We afiix our signal tures.

HARRY n. GIBBS.

ALFRED W. FRANCIS. 

